Originally Posted by BuddyRich
I'm running an iPad 3 via cck to audiolabs mdac via iPeng and Flacplayer apps.
Prior to ios7, 24/96 files played perfectly but now I get stutter. Most of the chatter in pro audio circles (as in usb midi input vs output) is that there are bugs in ios7 usb dac support that may also affect playback. 16/44 or 16/48 are not a problem.
This behavior is exactly what I have experienced with the iPhone 4 via CCK to the HRT microStreamer. 16/44 and 16/48 are no problem, but 24/96 stutters. Thanks for reporting this -- I've been on the lookout for a similar report of 24/96 issues in iOS 7 running on an iPad.
By the way, 24/96 on the Fiio E17 works with the iPhone 4 and the CCK through a USB hub as I have checked. Others have reported 24/96 playback being fine with other DACs (I think it was the Dragonfly?) So, the 24/96 problem in iOS 7 may be DAC specific. I'm also hopeful that HRT will update firmware to fix things if that is required, as they created firmware for the microStreamer to address iPad playback.
I never had DAC compatibility with the iPhone 4 before iOS 7, so I'm happy nevertheless. Even so, I've got an iPad mini and an iPad 2 that I am definitely not updating to iOS 7 until the bugs are worked out.